一种基于小波变换的零水印算法

在水印嵌入的时候,已有的大多数数字水印方法都是对原始图像数据信息作一定的运算修改,使得鲁棒性和安全性受到限制。而零水印不需要修改原始图像的任何信息,可以有更好的透明性。本文提出了一种基于图像置乱和小波变换的零水印算法:首先将水印图像进行置乱,然后利用载体图像一级小波分解后的低频子图和置乱后的水印图像得到提取矩阵,再对提取矩阵进行一定的打乱加密。利用提取矩阵来提取水印,增强了水印的透明性、鲁棒性和安全性。

A Zero-Watermarking Algorithm Based on Wavelet Transformation

Most existing methods of digital watermarking modify more or less the original image data for embedding watermarks,which limits the robustness and security.We can improve the transparency of watermarks through a zero-watermarking method since it need not modify the original image information.In this paper,a zero-watermarking algorithm based on scrambling and wavelet transformation is proposed.We get the extracted matrix through the scrambled watermark and low-frequency sub-image after wavelet transformation...